In March 2002, Mack Trucks self reported the inadvertent sale
of eight Midliner trucks equipped with 49 state engines. The difference between the California compliant engines
and the 49 state engines is that California requires a NOx emission rate of 4.0 g/bhphr or less, while the
federal EPA allows 4.6 g/bhp-hr under their non-conformance option. As part of the settlement, Mack recalled
the eight trucks to convert the engines to the California certified configuration. In addition, Mack
agreed to pay $52,000 to the California Air Pollution Control Fund to cover their own and the dealers' portion
of the penalties.